Update CHANGELOG.md
Update CHANGELOG.md

I edited the changelog; regrouped according to category; removed the token object example (don't use code we don't accept); and finally, removed the propname=T/F syntax, to avoid Django-centric vs JS-centric constructions.
splunk/splunk-webframework,splunk/splunk-webframework,splunk/splunk-webframework,splunk/splunk-webframework